Honeywell 9782 Series - Manual (Page 112)

Conductivity/Resistivity Analyzer/Controller
9782 Series Conductivity/Resistivity Analyzer/Controller - Operator’s Manual 7/99 9-4
9.4 On-Line Diagnostics and System Error Messages
Self-tests at 0.5 second intervals
On-line diagnostics are self-tests which are performed automatically as a background task every
1/2 second. The system error messages (displayed on the alarm stripe if a test is failed) are listed
in Table 9-3.
Output affected by error
In an error condition, the Analyzer will continue to perform all the functions it is capable of
except that the output signal(s) will go to 0%. (Output signal manipulation does not occur with
calibration failure or clock reset diagnostics.)
Table 9-3 On-Line Diagnostics and System Error Messages
SYSTEM ERROR
MESSAGE
WHEN
TESTED
CONDITION CORRECTIVE
ACTION
A/D CONV FAILURE background faulty analog-to-digital converter Have instrument serviced.
CELL 1 OUT OF RANGE
or
CELL 2 OUT OF RANGE
background Cell reading is out of range for
either the high or low limit of the
selected cell constant. The
cell’s display will stop updating
until the condition and alarm
message clears. Instead, to
indicate an invalid display, the
display will alternately flash 0.0
and either the last known value
or the high end limit for the cell
constant. Check cell to make sure it is
connected to terminals. Make
sure cell constant is correct for
expected conductivity range.
CELL 1 TEMP ERROR
or
CELL 2 TEMP ERROR
background Cell temperature compensator
faulty Check cell (see Note 1).
CLOCK RESET after power
failure Clock is on, but time may be
incorrect, or
clock is off as a result of the
power failure. Reset the time,
or
if clock is off, turn it on and reset
the time.
EPROM ERROR at reset faulty EPROM Have instrument serviced.
RAM DATA CORRUPTED background data in non-volatile memory has
been changed by a fault Power down, check power supply
and wiring for high voltage
spikes. Have instrument
serviced, if necessary.
RAM ERROR at reset faulty RAM Have instrument serviced.
RAM ERROR IN CPU at reset faulty RAM in microprocessor Have instrument serviced.
Note 1: Temperature compensator should be 8550 ohms at 25
°
C. If temperature compensator
fails, a conductivity instrument will be forced to its display range high limit. A resistivity
instrument will be forced to the low end of the range or zero.